The motor function is step-by-step. The fixation is very accurate. Even can correct to the level of millimeter. Advance Features: Power supply: AC230V +/- 10%, 50Hz Lift capacity: 44Kg (9 teeth), 32Kg (12 teeth) Motor: DC24V Working time: position limit protection automatic shut down within 20 second lift weight: 20 kgs Lift height: 3 m Length of Travel: 3m rail Output torque: 8 n Travel Rate: 5.77m/min (9 teeth), 7.7m/min (12 teeth) Bulb: AC240V 40W, when door starts, turn off 3 minutes after operation stop. Door Linkage: Adjustable door am. Pull cord trolley release. Safety: Push button and automatic reversal in down direction. Push button and automatic stop in up direction. Delay time 30 seconds auto-close. Electrical: Low voltage push button wiring. Chain Drive: flexible & smoothly control. Limit Adjustment: Electronic & infrared monitoring. Start Circuit: Low voltages push button circuit. Length (Overall): 3.26m(with standard rail) Two remote transmitters Installation: dry construction only. Learn More: http://www.gateoperatorkit.com